How can I make an invisible and so I can select through it
Restrict viewport selection
Go to the outliner and press the cursor symbol. The object can't be selected in the 3d viewport anymore, only in the outliner.

Restrict visibility
In the object properties area under Display, coose Wire as the Maximum Draw Type.

OR
Make the object invisible by pressing the eye icon. This is the same operation as selecting in the 3d view and pressing H to hide it.

Obviously, it will be made visible again, when ⎇ AltH is pressed to unhide other objects. And since it is unselectable, we can't even hide it again. An option would be to set a key by pressing I while hovering over the disabled eye icon, or setting a driver by right clicking on the eye icon and selecting Add Driver &gt; Manually (Create later).

the keyed property turns yellow, the driven property turns lilac
Unhiding everything with ⎇ AltH will still unhide the object, but it will disappear again on frameupdate (/ framechange).
Store it in another layer
Select the object and press M, then choose another layer, which you don't use. A drawback of this method is, that we have to enable the layer again, before rendering the scene. Objects in disabled layers don't get included in the render.